These free Kanji quizzes might help anyone wanting to better understand Japanese.
Kanji quizzes for general kanji, kanji quizzes for Japanese names, kanji verbs quiz, kanji adjective quiz, katakana quiz, japanese phrases quiz in romaji:
http://www.engless.com/sekai/japanese/japanese.php
and quizzes with phrases:
http://www.engless.com/sekai/japanese/japanese2.php
Kanji quizzes for general kanji, kanji quizzes for Japanese names, kanji verbs quiz, kanji adjective quiz, katakana quiz, japanese phrases quiz in romaji:
http://www.engless.com/sekai/japanese/japanese.php
and quizzes with phrases:
http://www.engless.com/sekai/japanese/japanese2.php